diff --git a/tests/test_ifs_sim.py b/tests/test_ifs_sim.py
index 3ea4d844fb1f938bdfde4005dd1688306555437d..39abe91407babb874ab677c741618f7cfa5c12cd 100644
--- a/tests/test_ifs_sim.py
+++ b/tests/test_ifs_sim.py
@@ -33,7 +33,9 @@ class TestDemoFunction(unittest.TestCase):
         # demo function test
         dir_path = os.path.join(os.environ['UNIT_TEST_DATA_ROOT'],'ifs_sim/')
         print(dir_path)
-        configfile = dir_path+'IFS_inputdata/configData/IFS_sim_C90.config'
+        ###configfile = dir_path+'IFS_inputdata/configData/IFS_sim_C90.config'
+        
+        configfile = 'IFS_sim_C90.config'
         skyfitsin = dir_path+'IFS_inputdata/FengshuaiData/NGC6397_S6102.fits'
         sourcein = 'SCI'
         print(configfile)